82 VARIATION, DISTRIBUTION, AND EVOLUTION OF THE GENUS PARTULA. 
East Central Region.—All of the localities within this territory except Saucio 
provided abundant collections, whose color-compositions are recorded in the cen- 
sus table (table 29). The significant facts revealed by the statistics (tables 32 and 
33) may be briefly noted. 
TABLE 33.—Partula gibba, Guam. East Central Region. 





Lip. 
Series. No. 
‘ : Faint 
White. | Yellowish, | Yelowish-) Faint | dich | None. | Trace, | Small 
brown. brown. b 
rown. 
Lolo: unicolor.......... 70 70 Ogee we ek ee 30 34 
mitellas cose cnc 47 36 8 3 aoe Tome 20 24 
pheea-rubra....... 56 20 36 34 20 
vespera-rosea...... $1 51 16 30 
VRP a Aan ree | eae | 177 8 3 36 ae 100 108 
Barrigarda: mitella........... 34 14 8 12 Gi ofan 29 5 
mitella-rubra...... 13 7 4 Zz ere cee 12 1 
phea-rubra....... 29 4 18 5 2 28 1 
vespera-rosea......| lil 111 see: Rive aes ret 101 8 
FAT Reigh Ek nee 187 136 30 19 2 170 15 
Ukudu: mitella.......4.:. 55 7 20 28 ees Behe Si 13 
mitella-rubra...... 17 12 1 4 as ai faa 6 6 
phea-rubra....... 1 Saat 1 raters “gpa AG ee oe 1 
All cans oie os 73 19 22 32 37 20 
Dededo: _ mitella........5.. 43 32 7 4 39 4 
mitella-rubra...... 47 40 2 5 43 4 
castanea-rubra.... 2 2 2 
pheea-rubra....... S 3 his Briere wniclts < ite 2 
phea-purpurea.... 3 3 a5here Sond atl Suter 3 
vespera-rosea...... Z 2 ; iui Rte 2 
vespera-cyanea.... 2 2 2 
ALS: sane eeee eee LOZ 84 9 4 5 94 8 
Saucio: mitellafoseess cs 2 6 +t 2 > 1 
mitella-rubra...... 3 2 1 1 2 
phea-rubra....... 1 < 1 1 ou 
phea-purpurea.... 1 aie 1 1 
vespera-rosea...... 1 1 Sa 1 


The strange unicolor class agrees remarkably with its associates, and gives no 
evidence of a size differentiation as an accompaniment of its distinctive coloration. 
The vespera-rosea of Lolo and Barrigarda conform fairly closely to the general con- 
ditions of their colonies taken as wholes; if at Barrigarda the shells of this class were 
noticeably different from their associates, then we might expect the same kind of 
departures in the average characters of the Lolo representatives if the latter were 
recent immigrants from the first-named locality. But such an episode, if indeed 
it actually occurred, must have been so remote as to permit the newly arrived type 
to amalgamate completely with others at Lolo, so far as the dimensions and _ pro- 
portions of the shells are concerned. 
